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Stressful treatments have long been associated with increased activity of brain catecholaminergic and serotonergic neurons. An intracerebroventricular (icv) injection of the corticotropin-releasing factor (CRF) also activates brain catecholaminergic neurons. Because brain CRF-containing neurons appear to be activated during stress, it is possible that CRF mediates the catecholaminergic activation...
Increases in the brain concentrations of tryptophan and in serotonin (5-HT) metabolism are commonly observed in animals under stress. Previous experiments indicated that the increase in brain tryptophan and 5-hydroxyindoleacetic acid (5-HIAA) observed in response to administration of endotoxin (lipopolysaccharide, LPS) and interleukin-1 (IL-1) were largely prevented by pretreatment with N-nitro-L-arginine...
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